A timeline of mass shootings in the United States

Associated Press

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Sept. 5, 1949: Camden, N.J.

Army veteran Howard Unruh gunned down 13 people while walking around his neighborhood. He was declared a paranoid schizophrenic and sent to a psychiatric hospital without a trial. He died in 2009 at a Trenton, N.J., nursing facility.

Associated Press

2of29

Sept. 5, 1949: Camden, N.J.

Army veteran Howard Unruh gunned down 13 people while walking around his neighborhood. He was declared a paranoid schizophrenic and sent to a psychiatric hospital without a trial. He died in 2009 at a Trenton, N.J., nursing facility.